•Declination: used to
measure latitude above or below the celestial equator.
Projection of the Earth’s equator up into the sky.
•Right Ascension: used to
measure the longitude on the celestial sphere = sidereal
•Sidereal Time: the
measurement of time with respect to the movement of stars. A
sidereal clock would show that the stars rise at the same time every
night while an ordinary clock would indicate that they rise about
4 minutes later every night.